JPH0127092B2 - - Google Patents
Info
- Publication number
- JPH0127092B2 JPH0127092B2 JP53161307A JP16130778A JPH0127092B2 JP H0127092 B2 JPH0127092 B2 JP H0127092B2 JP 53161307 A JP53161307 A JP 53161307A JP 16130778 A JP16130778 A JP 16130778A JP H0127092 B2 JPH0127092 B2 JP H0127092B2
- Authority
- JP
- Japan
- Prior art keywords
- reactor
- reaction
- rotor
- reactors
- stator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000006243 chemical reaction Methods 0.000 claims description 67
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 52
- 239000004952 Polyamide Substances 0.000 claims description 36
- 229920002647 polyamide Polymers 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 29
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 26
- 239000003054 catalyst Substances 0.000 claims description 25
- 239000011541 reaction mixture Substances 0.000 claims description 23
- 238000006068 polycondensation reaction Methods 0.000 claims description 22
- 239000000376 reactant Substances 0.000 claims description 17
- 238000009833 condensation Methods 0.000 claims description 16
- 230000005494 condensation Effects 0.000 claims description 16
- 229920000642 polymer Polymers 0.000 claims description 15
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 150000001408 amides Chemical group 0.000 claims description 2
- BUZRUIZTMOKRPB-UHFFFAOYSA-N carboxycarbamic acid Chemical compound OC(=O)NC(O)=O BUZRUIZTMOKRPB-UHFFFAOYSA-N 0.000 claims 1
- 239000000047 product Substances 0.000 description 19
- -1 hydroxyl glycols Chemical class 0.000 description 9
- 150000002334 glycols Chemical class 0.000 description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 7
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 6
- 229910052783 alkali metal Inorganic materials 0.000 description 5
- 150000001340 alkali metals Chemical class 0.000 description 5
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 5
- 150000001342 alkaline earth metals Chemical class 0.000 description 5
- 150000001991 dicarboxylic acids Chemical class 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229920002292 Nylon 6 Polymers 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- 235000011037 adipic acid Nutrition 0.000 description 3
- 239000001361 adipic acid Substances 0.000 description 3
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 3
- BSDOQSMQCZQLDV-UHFFFAOYSA-N butan-1-olate;zirconium(4+) Chemical compound [Zr+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] BSDOQSMQCZQLDV-UHFFFAOYSA-N 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000012429 reaction media Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- PBLZLIFKVPJDCO-UHFFFAOYSA-N 12-aminododecanoic acid Chemical compound NCCCCCCCCCCCC(O)=O PBLZLIFKVPJDCO-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical group [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 150000001413 amino acids Chemical class 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 150000004985 diamines Chemical class 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229910052735 hafnium Inorganic materials 0.000 description 2
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 150000003951 lactams Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229920001451 polypropylene glycol Polymers 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- TYFQFVWCELRYAO-UHFFFAOYSA-N suberic acid Chemical compound OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 2
- LWBHHRRTOZQPDM-UHFFFAOYSA-N undecanedioic acid Chemical compound OC(=O)CCCCCCCCCC(O)=O LWBHHRRTOZQPDM-UHFFFAOYSA-N 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 125000004209 (C1-C8) alkyl group Chemical group 0.000 description 1
- PXGZQGDTEZPERC-UHFFFAOYSA-N 1,4-cyclohexanedicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)CC1 PXGZQGDTEZPERC-UHFFFAOYSA-N 0.000 description 1
- GUOSQNAUYHMCRU-UHFFFAOYSA-N 11-Aminoundecanoic acid Chemical compound NCCCCCCCCCCC(O)=O GUOSQNAUYHMCRU-UHFFFAOYSA-N 0.000 description 1
- QFGCFKJIPBRJGM-UHFFFAOYSA-N 12-[(2-methylpropan-2-yl)oxy]-12-oxododecanoic acid Chemical compound CC(C)(C)OC(=O)CCCCCCCCCCC(O)=O QFGCFKJIPBRJGM-UHFFFAOYSA-N 0.000 description 1
- WTKWFNIIIXNTDO-UHFFFAOYSA-N 3-isocyanato-5-methyl-2-(trifluoromethyl)furan Chemical compound CC1=CC(N=C=O)=C(C(F)(F)F)O1 WTKWFNIIIXNTDO-UHFFFAOYSA-N 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- QFNNDGVVMCZKEY-UHFFFAOYSA-N azacyclododecan-2-one Chemical compound O=C1CCCCCCCCCCN1 QFNNDGVVMCZKEY-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- RLSSMJSEOOYNOY-UHFFFAOYSA-N m-cresol Chemical compound CC1=CC=CC(O)=C1 RLSSMJSEOOYNOY-UHFFFAOYSA-N 0.000 description 1
- 229940100630 metacresol Drugs 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- TVIDDXQYHWJXFK-UHFFFAOYSA-N n-Dodecanedioic acid Natural products OC(=O)CCCCCCCCCCC(O)=O TVIDDXQYHWJXFK-UHFFFAOYSA-N 0.000 description 1
- SXJVFQLYZSNZBT-UHFFFAOYSA-N nonane-1,9-diamine Chemical compound NCCCCCCCCCN SXJVFQLYZSNZBT-UHFFFAOYSA-N 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001693 poly(ether-ester) Polymers 0.000 description 1
- 238000012643 polycondensation polymerization Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 235000011044 succinic acid Nutrition 0.000 description 1
- 150000003444 succinic acids Chemical class 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- HQHCYKULIHKCEB-UHFFFAOYSA-N tetradecanedioic acid Natural products OC(=O)CCCCCCCCCCCCC(O)=O HQHCYKULIHKCEB-UHFFFAOYSA-N 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/44—Polyester-amides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J10/00—Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor
- B01J10/02—Chemical processes in general for reacting liquid with gaseous media other than in the presence of solid particles, or apparatus specially adapted therefor of the thin-film type
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Polyamides (AREA)
- Polyesters Or Polycarbonates (AREA)
- Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7739790A FR2413417A1 (fr) | 1977-12-30 | 1977-12-30 | Procede de synthese en continu de copolycondensats sequences poly(ether-ester-amide) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54129089A JPS54129089A (en) | 1979-10-06 |
| JPH0127092B2 true JPH0127092B2 (zh) | 1989-05-26 |
Family
ID=9199553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16130778A Granted JPS54129089A (en) | 1977-12-30 | 1978-12-28 | Continuous synthesis of poly*etherresterr amide* sequence condensate polymer |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4208493A (zh) |
| JP (1) | JPS54129089A (zh) |
| BR (1) | BR7808617A (zh) |
| CH (1) | CH635116A5 (zh) |
| DE (1) | DE2856787A1 (zh) |
| FR (1) | FR2413417A1 (zh) |
| GB (1) | GB2011450B (zh) |
| IT (1) | IT1101545B (zh) |
| NL (1) | NL186580B (zh) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2932234C2 (de) * | 1979-08-09 | 1982-01-28 | Chemische Werke Hüls AG, 4370 Marl | Verfahren zur Herstellung von Polyether(ester)amiden |
| DE2936977C2 (de) * | 1979-09-13 | 1986-06-12 | Hüls AG, 4370 Marl | Verfahren zur Herstellung von Polyether(ester)amiden |
| DE3040612A1 (de) * | 1980-10-29 | 1982-05-27 | Bayer Ag, 5090 Leverkusen | Copolymerisate aus cyclischen kohlensaeureestern und lactamen und ihre herstellung |
| DE3040613A1 (de) * | 1980-10-29 | 1982-06-03 | Bayer Ag, 5090 Leverkusen | Copolymerisate aus aliphatischen polycarbonaten und lactamen |
| FR2497518A1 (fr) * | 1981-01-05 | 1982-07-09 | Ato Chimie | Compositions adhesives thermofusibles a base de copolyetheramides sequences |
| JPS58206628A (ja) | 1982-05-27 | 1983-12-01 | Toray Ind Inc | ポリエ−テルエステルアミドの製造方法 |
| DE3373039D1 (en) * | 1982-10-01 | 1987-09-17 | Raychem Ltd | Electric wire with flame retarded cladding |
| JPS6026028A (ja) * | 1983-07-25 | 1985-02-08 | Daicel Chem Ind Ltd | ポリアミドエラストマ−の製造法 |
| CH658063A5 (de) * | 1983-08-05 | 1986-10-15 | Inventa Ag | Verfahren zur herstellung von hydrolysestabilen blockpolyetheresteramiden. |
| DE3406951A1 (de) * | 1984-02-25 | 1985-08-29 | Chemische Werke Hüls AG, 4370 Marl | Formmassen auf basis von hochmolekularen poly(etheresteramiden) |
| CH662356A5 (fr) * | 1985-04-04 | 1987-09-30 | Firmenich & Cie | Article pour la diffusion de vapeurs assaississantes a base de resine polyamide et polyether. |
| DE3684662D1 (de) * | 1985-04-26 | 1992-05-07 | Asahi Chemical Ind | Durchsichtiges polyamidelastomer. |
| US4698242A (en) * | 1985-08-12 | 1987-10-06 | National Starch And Chemical Corporation | Thermoplastic elastic adhesive containing polyether block amides |
| JPS6483801A (en) * | 1987-09-25 | 1989-03-29 | Aisin Seiki | Rotor device |
| WO1991001343A1 (en) * | 1989-07-18 | 1991-02-07 | Sun Chemical Corporation | Pigment dispersants |
| AU671617B2 (en) | 1992-03-13 | 1996-09-05 | Mcneil-Ppc, Inc. | Bicomponent polymeric films containing block poly(ether-co-amides) |
| US5239004A (en) * | 1992-07-15 | 1993-08-24 | The Goodyear Tire & Rubber Company | Polyether ester amide-sulfur vulcanized rubber compounds |
| US6616549B2 (en) * | 1995-06-07 | 2003-09-09 | Acushnet Company | Multi-layer high spin golf ball |
| CA2312479A1 (en) | 1997-12-03 | 1999-06-10 | Bayer Aktiengesellschaft | Polyether ester amides |
| US7166656B2 (en) * | 2001-11-13 | 2007-01-23 | Eastman Kodak Company | Smectite clay intercalated with polyether block polyamide copolymer |
| US6590065B1 (en) * | 2001-12-10 | 2003-07-08 | E. I. Du Pont De Nemours And Company | Polytrimethylene ether ester amide and use thereof |
| BE1018457A3 (nl) * | 2008-11-13 | 2010-12-07 | Luxilon Ind Nv | Werkwijze voor het verspinnen van polyether-blok-amides, en vezels volgens deze werkwijze bekomen, alsook producten met deze vezels vervaardigd. |
| CN107325291A (zh) * | 2017-08-09 | 2017-11-07 | 无锡殷达尼龙有限公司 | 一种连续化生产聚醚酰胺弹性体的方法 |
| CN107936255B (zh) * | 2017-11-01 | 2021-03-02 | 中纺院（天津）科技发展有限公司 | 一种连续生产聚醚酰胺的方法 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4916555A (zh) * | 1972-06-09 | 1974-02-14 | ||
| JPS50159586A (zh) * | 1974-05-31 | 1975-12-24 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1181908B (de) * | 1956-03-12 | 1964-11-19 | Henkel & Cie Gmbh | Verfahren zur Herstellung wasserloeslicher kapillaraktiver Carbonamidgruppen ent-haltender Polyester |
| DE1495800A1 (de) * | 1964-05-13 | 1969-05-29 | Bayer Ag | Verfahren zur Herstellung von Polyaetheresteramiden |
| DE1921738A1 (de) * | 1969-04-29 | 1970-11-12 | Bayer Ag | Polyesteramidelastomere mit Polyaethersegmenten |
-
1977
- 1977-12-30 FR FR7739790A patent/FR2413417A1/fr active Granted
-
1978
- 1978-12-22 IT IT31251/78A patent/IT1101545B/it active
- 1978-12-22 GB GB7849813A patent/GB2011450B/en not_active Expired
- 1978-12-28 JP JP16130778A patent/JPS54129089A/ja active Granted
- 1978-12-28 US US05/973,885 patent/US4208493A/en not_active Expired - Lifetime
- 1978-12-29 DE DE19782856787 patent/DE2856787A1/de active Granted
- 1978-12-29 NL NLAANVRAGE7812666,A patent/NL186580B/xx not_active Application Discontinuation
- 1978-12-29 CH CH1329678A patent/CH635116A5/fr not_active IP Right Cessation
- 1978-12-29 BR BR7808617A patent/BR7808617A/pt unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4916555A (zh) * | 1972-06-09 | 1974-02-14 | ||
| JPS50159586A (zh) * | 1974-05-31 | 1975-12-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54129089A (en) | 1979-10-06 |
| NL186580B (nl) | 1990-08-01 |
| IT7831251A0 (it) | 1978-12-22 |
| IT1101545B (it) | 1985-10-07 |
| CH635116A5 (fr) | 1983-03-15 |
| US4208493A (en) | 1980-06-17 |
| GB2011450A (en) | 1979-07-11 |
| DE2856787C2 (zh) | 1989-07-06 |
| GB2011450B (en) | 1982-12-15 |
| NL7812666A (nl) | 1979-07-03 |
| BR7808617A (pt) | 1979-07-10 |
| FR2413417B1 (zh) | 1981-12-18 |
| FR2413417A1 (fr) | 1979-07-27 |
| DE2856787A1 (de) | 1979-07-12 |
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